No, the alu bars don't have proper internal routing. This is the only pair of bars in the pro range "designed for Di2 internal routing" other than the Aero versions of the Vibe, that ACTUALLY internally route both brake and Di2 so you can bar end junction and do away with the under-stem-sling.
I've been using 3T Tornova LTD, which lasted 2 rides as they're made of cheese and Deda SuperZero Alloy, which have actually been fucking amazing, albeit I hate their shape. Otherwise, apart from other 3T variants (all made of the same cheese) and a few outrageously priced super brands (Schmolke, ENVE, etc - albeit all Aero variants with stupidly large flat tops) I haven't found a single normally shaped compact drop handlebar with FULL internal routing other than the Pro Vibe Carbon Monococque.
If you're after the same holy grail and have £270 spare I'd order a pair from sigma to check them out (before they disappear into "unknown delivery date" territory again, or pop over to me this week/end and get a feel for them and then order a pair.
No, the alu bars don't have proper internal routing. This is the only pair of bars in the pro range "designed for Di2 internal routing" other than the Aero versions of the Vibe, that ACTUALLY internally route both brake and Di2 so you can bar end junction and do away with the under-stem-sling.
I've been using 3T Tornova LTD, which lasted 2 rides as they're made of cheese and Deda SuperZero Alloy, which have actually been fucking amazing, albeit I hate their shape. Otherwise, apart from other 3T variants (all made of the same cheese) and a few outrageously priced super brands (Schmolke, ENVE, etc - albeit all Aero variants with stupidly large flat tops) I haven't found a single normally shaped compact drop handlebar with FULL internal routing other than the Pro Vibe Carbon Monococque.
And I've been looking for almost a year.